<template>
  <div class="row">
    <div v-for="column in columnList" :key="column.id" class="col-4 mb-4">
      <div class="card h-100 shadow-sm">
        <div class="card-body text-center">
            <img :src="column.avatar" class="rounded-circle border border-light w-25 my-3" :alt="column.title" />
          <h5 class="card-title">{{ column.title }}</h5>
          <p class="card-text">{{ column.description }}</p>
          <a href="#" class="btn btn-outline-primary">进入专栏</a>
        </div>
      </div>
    </div>
  </div>
</template>
<script lang="ts">
import { computed, defineComponent, PropType } from "vue";
export interface ColumnProps {
  id: number;
  title: string;
  avatar?: string;
  description: string;
}
export default defineComponent({
  name: "ColumnList",
  props: {
    list: {
      type: Array as PropType<ColumnProps[]>,
      required: true,
    },
  },
  setup(props){
      const columnList = computed(() => {
          return props.list.map(column => {
              if(!column.avatar) {
                  column.avatar = require('@/assets/logo.png')
              }
              return column
          })
       })
      return{
          columnList
      }
  }
});
</script>